The Darkness Crystal

NM,  Black spells you cast cost 1 less to cast.If a nontoken creature an opponent controls would die, instead exile it and you gain 2 life.4BB, T: Put target creature card exiled with The Darkness Crystal onto the battlefield tapped under your control with two additional +1/+1 counters on it.
 
Rarity:R #:96 Card Type:Legendary Artifact